So the global record holders for these tracks are the Lexus LFA and Bugatti Veryon respectively.
What would be the "next best" cars for these tracks?
Uptown: Astin Martin One-77 Withdrawal: Mercedes SLR
So how about Speedway and Convict?
Those two cars, the Astin Martin One-77 and Mercedes SLR have exactly the same stats. So, if you're going to upgrade them both to be LR T3 you can just buy one and save your racing points for another car.